FA3864X LED Orange Clear 3MM Round T/H Equivalent & Substitute Parts

Part Overview

The FA3864X is an orange LED indication component manufactured by Stanley Electric Co, featuring a 3mm round domed lens with through-hole radial mounting. This discrete LED operates at 1.9V forward voltage with a 280mcd brightness rating and 605nm dominant wavelength. The component is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements. Substitute parts must maintain compatibility with the original electrical specifications, mechanical form factor, and mounting configuration while offering improved availability and compliance status.

Key Parameters

Parameter	FA3864X Value	Substitution Criticality
Color	Orange	Critical
Lens Size	3mm, T-1	Critical
Mounting Type	Through Hole Radial	Critical
Voltage - Forward (Vf) (Typ)	1.9V	High
Current - Test	20mA	High
Wavelength - Dominant	605nm	High
Millicandela Rating	280mcd	Medium
Lens Transparency	Clear	Medium
Lens Style	Round with Domed Top	Medium
Package / Case	Radial	Critical

Substitute Part Grouping Explanation

Substitute parts for the FA3864X are categorized based on alignment with critical electrical and mechanical parameters. The primary substitution criteria are:

Critical Parameters (Must Match):

Color: Orange
Lens Size: 3mm, T-1
Mounting Type: Through Hole Radial
Package / Case: Radial

High Priority Parameters (Should Match):

Voltage - Forward (Vf): 1.9V nominal
Current - Test: 20mA
Wavelength - Dominant: 605nm

Secondary Parameters (Acceptable Variation):

Millicandela Rating: Brightness may vary within application tolerance
Viewing Angle: May differ based on lens design
Height: Minor variations acceptable within mechanical envelope

Direct Equivalent: FHA3C64X from Stanley Electric Co maintains identical critical parameters with improved product status (Active vs. Obsolete) and enhanced brightness (350mcd vs. 280mcd) at identical electrical specifications.

Similar Substitutes: Parts from Broadcom Limited (HLMP-Y402-G0000) and Rohm Semiconductor (SLI-343DC3F) match color, lens size, mounting type, and wavelength specifications. These parts exhibit variations in forward voltage (2.1V and 1.9V respectively) and brightness ratings, requiring circuit evaluation for compatibility.

Non-Equivalent Parts: Parts listed as yellow (5219431F, HLMP-1420, HLMP-1421, LTL-4252N, LTL1CHJSTNN) and red (HLMA-KH00-J0000) do not meet the critical color parameter and are unsuitable for direct substitution in orange LED indication applications.

Parameter Comparison

Parameter	FA3864X	FHA3C64X	HLMP-Y402-G0000	SLI-343DC3F
Manufacturer	Stanley Electric Co	Stanley Electric Co	Broadcom Limited	Rohm Semiconductor
Product Status	Obsolete	Active	Active	Not For New Designs
Color	Orange	Orange	Orange	Orange
Lens Size	3mm, T-1	3mm, T-1	3mm, T-1	3.10mm Dia
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Voltage - Forward (Vf) (Typ)	1.9V	1.9V	2.1V	1.9V
Current - Test	20mA	10mA	20mA	20mA
Wavelength - Dominant	605nm	603nm	605nm	605nm
Millicandela Rating	280mcd	350mcd	29mcd	500mcd
Lens Transparency	Clear	Clear	Clear	Clear
Lens Style	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top
Viewing Angle	70°	Not Specified	45°	40°
Height (Max)	5.40mm	5.40mm	5.20mm	5.60mm
RoHS Status	Not Specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	Not Applicable	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99	EAR99	EAR99
HTSUS	8541.41.0000	8541.41.0000	8541.41.0000	8541.41.0000

Engineering Selection Recommendations

Primary Recommendation: FHA3C64X

The FHA3C64X from Stanley Electric Co is the preferred direct equivalent for FA3864X replacement. This part maintains identical forward voltage (1.9V), matching wavelength (603nm vs. 605nm), identical lens size (3mm T-1), and identical mounting configuration. The FHA3C64X offers active product status with ROHS3 compliance and unlimited moisture sensitivity rating. The increased brightness rating (350mcd vs. 280mcd) at reduced test current (10mA vs. 20mA) provides improved efficiency. Mechanical compatibility is confirmed with identical maximum height (5.40mm). This part is suitable for both new designs and direct replacement in existing applications.

Secondary Recommendation: HLMP-Y402-G0000

The HLMP-Y402-G0000 from Broadcom Limited provides an active alternative with matching color, lens size, and mounting type. This part operates at 2.1V forward voltage with 20mA test current, requiring circuit evaluation for voltage compatibility. The dominant wavelength (605nm) matches the original specification. The significantly reduced brightness rating (29mcd vs. 280mcd) limits applicability to low-intensity indication applications. ROHS3 compliance and unlimited MSL rating confirm regulatory alignment. This part is suitable only where reduced brightness is acceptable and circuit voltage tolerance permits 2.1V operation.

Tertiary Recommendation: SLI-343DC3F

The SLI-343DC3F from Rohm Semiconductor offers matching electrical specifications (1.9V, 605nm) with superior brightness (500mcd). However, this part carries "Not For New Designs" status, limiting its use to legacy system maintenance and existing production runs with established qualification. The slightly larger lens diameter (3.10mm vs. 3mm) and increased height (5.60mm vs. 5.40mm) require mechanical envelope verification. ROHS3 compliance and unlimited MSL rating are confirmed. This part is acceptable only for continuation of existing designs where new design restrictions do not apply.

Not Recommended: Yellow and red LED alternatives (5219431F, HLMP-1420, HLMP-1421, HLMP-1421-F0002, LTL-4252N, LTL1CHJSTNN, HLMA-KH00-J0000) do not meet the critical color parameter and are unsuitable for orange LED indication applications.

Frequently Asked Questions (FAQ)

Q: Can FHA3C64X directly replace FA3864X without circuit modification?

A: Yes. The FHA3C64X maintains identical forward voltage (1.9V) and wavelength (605nm) specifications. The reduced test current (10mA vs. 20mA) indicates improved efficiency but does not prevent direct substitution. Mechanical compatibility is confirmed with identical lens size and height. No circuit modification is required.

Q: Why is HLMP-Y402-G0000 listed as a substitute if it has different voltage?

A: The HLMP-Y402-G0000 is listed as a similar substitute based on matching color, lens size, mounting type, and wavelength. The 2.1V forward voltage represents a 0.2V increase requiring circuit evaluation. This part is suitable only for applications where the circuit can tolerate this voltage variation or where brightness reduction (29mcd) is acceptable for the intended indication function.

Q: What is the significance of the "Not For New Designs" status on SLI-343DC3F?

A: "Not For New Designs" indicates the manufacturer recommends against using this part in new product development. However, the part remains available for legacy system support and continuation of existing production. Use of SLI-343DC3F is acceptable only for maintenance of established designs where qualification history exists.

Q: Are yellow LED parts (HLMP-1420, LTL-4252N) acceptable substitutes?

A: No. Yellow LEDs do not meet the critical color parameter for orange LED indication applications. Color is a fundamental functional requirement that cannot be substituted. Yellow parts are listed in the reference data only to document parts that were evaluated and rejected.

Q: What mechanical parameters must match for through-hole LED substitution?

A: Critical mechanical parameters are lens size (3mm T-1), mounting type (through-hole radial), and package configuration (radial). Height variations within approximately 1mm are generally acceptable if the component fits within the mechanical envelope. Lens diameter tolerance of ±0.1mm is acceptable for standard 3mm packages.

Q: How does the viewing angle affect substitution compatibility?

A: Viewing angle is a secondary parameter. The FA3864X specifies 70° while substitutes range from 40° to 45°. Narrower viewing angles concentrate light intensity but reduce peripheral visibility. Selection depends on the specific application requirement. If the original design requires 70° viewing angle, narrower alternatives may not be suitable.

Q: What compliance certifications are critical for substitution?

A: ROHS3 compliance and REACH status are regulatory requirements for most applications. All recommended substitutes (FHA3C64X, HLMP-Y402-G0000, SLI-343DC3F) maintain ROHS3 compliance and REACH Unaffected status, matching the original part's regulatory alignment. ECCN and HTSUS classifications are identical across all parts.

Q: Can brightness differences affect circuit operation?

A: Brightness (millicandela rating) affects visual indication intensity but not circuit operation. The FA3864X operates at 280mcd while FHA3C64X provides 350mcd at lower current. HLMP-Y402-G0000 provides only 29mcd. Selection depends on the required indication brightness for the application. Higher brightness may require reduced circuit current to maintain equivalent visual intensity.

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